Lettuce at Taco Bell in five states confirmed as source of a diarrhea-causing parasite outbreak - CNBC

Federal health officials have identified lettuce from Mexico served by Taco Bell locations across five U.S. states as a source of the widespread outbreak of diarrhea-causing parasite cyclospora.

The Centers for Disease Control and Prevention late Thursday confirmed the source and warned consumers not to eat shredded iceberg lettuce from Yum Brands ' Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio and West Virginia.

A Food and Drug Administration investigation identified a single supplier of the lettuce. The federal warnings to consumers did not identify the company.

"FDA is working with the supplier of iceberg lettuce to determine if potentially contaminated shredded iceberg lettuce remains on the market," including in other states, the CDC said. "Taco Bell has committed to stop using any lettuce from the supplier identified by FDA's traceback investigation."

CDC, FDA and public health officials in several states have been investigating a multistate outbreak of cyclospora infections.